If you're new to the look: start with black lace and one statement detail. A harness strap or a chain reads gothic without committing to head to toe vinyl.
If you want structure: a steel boned corset does the most work. Wear it over a teddy, or with a bra set and thigh highs.
If comfort matters: choose stretch mesh and lace over wet look. Vinyl and faux leather do not breathe and get warm fast.
If you're shooting content: mix textures. Matte lace next to shiny wet look reads far better on camera than one flat black fabric.
If you're between sizes: pick adjustable harness and lace-up styles. Straps and ties cover a wider range than fixed pieces.